package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.util.spi.LocaleNameProvider;

/**
 * 自定义切面，实现公共字段自定填充处理逻辑
 */


@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}
    /**
     * 前置通知，为通知中的公共字段进行赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException {
        log.info("Auto fill start");
//        获取到当前被拦截的方法数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//获取签名方法
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型
        Object[] args = joinPoint.getArgs();
        if(args==null || args.length==0){
            return;
        }

        Object entity =  args[0] ;



//        获取到当前被拦截方法的参数--实体对象
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

//        准备赋值的数据
        if(operationType==OperationType.INSERT){
            //为四个公共字段赋值
            try{
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, LocalDateTime.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);


            } catch(Exception e){
            e.printStackTrace();
            }


        }else if(operationType==OperationType.UPDATE){
            //为四个公共字段赋值
            try{
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, LocalDateTime.class);
                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);


            } catch(Exception e){
                e.printStackTrace();
            }

        }




    }
}
